The spill occurred after an explosion on the Deepwater Horizon drilling rig killed 11 workers on April 20, 2010. Far surpassing BP‘s initial estimates, about 50,000 barrels per day flowed from the well over the course of three months, according to a government-organized scientific team.

The Greenpeace press release states that the photos, many focused on oil-covered sea turtles, “appear to be part of the effort to collect evidence for the prosecution of BP and others.”

Greenpeace’s John Hocevar stated in the organization’s press release, “While the White House was trying to keep the emphasis on rosy stories of rescued animals being released back into the wild, they were sitting on these images of garbage bags full of Kemp’s Ridley sea turtles.”